Vehicle brake



March 18. 19240 c. D- STEWART VEHICLE BRAKE Filed May 5. 1921 ahmwmhhfi I .5.

INVENTOR CARLTON D; STEWART may Patented Eider, l8, lean entree @ARLTON PD. STEWART, 015 E AIR BRAKE COEPANY,

FWNSYLVANIAW T9 THE WTH'ZGMUUQE vmrorin BRAKE,

Application filed ma a, 1921 serial in. newer.

To all whom it may concern:

Be it known that 1, Cameron D. STEWART, a citizen of the United States, residing at Berkeley, in the county. of Alameda and State of California, have invented new'and useful Improvements in Vehicle Brakes, of which the following is a specification.

This invention relates to brakes, and more particularly to a brake controlling device for motor vehicles.

The principal object of my invention is to provide means for controllin the brakes through the manipulation oft e means for controlling the'application of power'to the vehicle.

Other objects will appear in the following more detailed description of the invention.

In the accompanying drawing; 1 is an elevational view of the steering and power control mechanism of a motor vehicle, showing my invention applied thereto; Fig. 2 an inverted plan View of the construction shown in Fig. 1; Fig. 3 a plan view of the steering wheel portion; Fig. t a side elevation of the contact-drum; and Fig. 5 a diagrammatic view, showing the vehicle brake apparatus and the wiring connections therel lccording to my invention, the usual hand throttle for. controlling the power is also employed for controlling the brakes of the vehicle and for this purpose, the usual quadrant is extended, so that the hand throttle lever may be moved throu h a certain are, from the usual idling position, for controlling the brakes,

As shown in the drawing, the quadrant 1 of the hand throttle lever 2 is extended to permit excess movement of the throttle lever beyond the usual. idling osition.

Connected to the usua throttle shaft 3 is a lever l for operating a stem 5 and on the stem are secured adjustable stops 6 and 7.

The stop 6 is adapted to engage the end of a lever 8 for operatin the usual carbure tor 9 upon movement the stem'5 in one direction and the stop 7 is adapted to engage a lever 10 for controllin the brakes upon movement of the stem 1n the opposite direction.

A coil spring 11' attached to the lever 8 tends to resist movement of the lever by the stop 6 and a coil spring 12 attached to the lever tends to resist movement of the lever by the stop 7,

comprising tion, rotates the shaft 3 so to The movement of the lever 10 may be utilized to control any desired type of brake including fluid pressure brakes, but in the drawing, the lever is arranged to control an electro-pneumatic brake. I

For this-purpose, a contact drum 13 is connected to the lever 10, so that the movement of said lever rotates the drum. On the drum 13 ma be two contacts I l and 15, the contact 14 eing engageable by a. contact finger 16 connected to a train wire 17 and the contact finger engageable by a contact finger l8 connected to a train wire 19, said contacts 14 and being connected to a grounded source of current 20.

t a convenient place on the vehicle is mounted an electro-pneumatic valve device a valve head 21, a release magnet 22, and an application magnet 23, The release magnet 22 has one terminal connected to the train wire 17. and the application magnet 23 has, one terminal connected to the train wire 19, the other terminal of each magnet bein connected to ground, as shown.

In the va ve head 21 is a valve chamber 24 containing a release valve 31, adapted to be operated by the magnet 22- and a valve chamber 25, containing an application valve 26, adapted to be operatedby magnet 23.

Connected by pipe 27 to valve chamber is a reservoir 28, which is normally charged with fluid under pressure and connected by pipe 29 to valve chamber 24 is a brake cylinder 30, the admission and release of fluid under pressure to and from the'hrahe' cylinder, bein adapted to efiect the application and re ease of the brakes on the vehicle.

In the'usual idling position, which may also be wrmed the neutral position or" the throttle lever 2, the stop 6 engages the lever 8 and movement of the throttle lever 2 counter-clockwise from the neutrrg e the rod 5 and cause the stop 6 to carburetor lever 8.,

. In the neutral or idling position, the stop 7 does not engage the lever 10 and the drum 18 is in position so that the contact finger 16 engages the contact 14a The cir- (suit is thus closed through the wire 17, so that the release magnet 22 is energized to open the release valve 311 and thereby connect the brake cylinder 3% 32 and valve chamber 2% wiatmospheric exhaust port 3,3,

Mill

When it is desired to apply the brakes, the lever 2 is turned clockwise from the neutral or idling position, so as to rotate the shaft 3 in a direction for lifting the stem 5. After the lost motion is taken up, the stop 7 engages the lever 10 and the drum 13 is rotated, so that the contact 14 is moved out of contact with the contact finger 16, While the contact 15 is moved into contact with the contact finger 18.

The release magnet is then dee'nergized so as to permit the release valve 31 to close and the application ma et 23 is energized to open the valve 26 an permit fluid under pressure to flow from the reservoir 28 through pipe 27 to valve chamber and thence past the open valve to pipe 29 and the brake cylinder 30.

When the brakes have been applied with su'fiicient pressure and it is desired to hold the pressure in the brake cylinder, the lever 2 may be moved hack'toward the neutral position, so that the contact 15 moves out of engagement with finger 18 but not far enough to cause the contact 14: to engage finger 16. ln this position, therefore, both the application magnet circuit is opened to prevent further supply of fluid to the brake cylinder 30 and the release magnet circuit is opened to close the release valve 31 and prevent the escape of fluid from the brake cylinder.

incense The brakes maybe either Wholly or partially released by moving the lever 2 back to neutral osition, in which the release ma et 22 1s ener 'zed, according to the length of time the ever 2 is allowed to remain in the neutral position.

lt will now be apparent that with the above described construction, the vehicle brakes may be readily controlled by merely moving the usual throttle lever through an additional range of movement.

Having now described my invention, What ll claim as new and desire to secure by Letters Patent, is

1. In a motor vehicle control apparatus, the combination With a carburetor and a lever for operating same, of an electro-pneumatic brake apparatus, a contact drum for controlling. the circuits of said apparatus, a lever for operating said drum, and a throttle lever operatively connected to said levers.

2. In a motor vehicle control apparatus,

the combination with a vehicle brake aparatus, of a manually operated lever havmg a range of movement for controlling the power, a position for operating said apparatus to apply the brakes, a position -for releasing the brakes, and an intermediate position for holding the brakes applied.

In testimony Whereo l have hereunto set m hand.

y CARLTON D. STEWART. 

